| If
the load is not continuous and is much shorter than the
thermal time constant (the time taken to reach steady
on-load temperature, which can be several hours), a
smaller transformer can often be specified. The
following formula is helpful in calculating the rating
needed.
Where: Power
Nom. = Nominal transformer rating
Power Load =
Actual power in the load
t on = Load on time
t tot
= Total cycle time |
